diff options
Diffstat (limited to 'REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_remquol.c')
| -rw-r--r-- | REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_remquol.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_remquol.c b/REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_remquol.c new file mode 100644 index 0000000000..9b6ec09d41 --- /dev/null +++ b/REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_remquol.c @@ -0,0 +1,119 @@ +/* Compute remainder and a congruent to the quotient. + Copyright (C) 1997-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and + Jakub Jelinek <jj@ultra.linux.cz>, 1999. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <math.h> + +#include <math_private.h> +#include <math_ldbl_opt.h> + + +static const long double zero = 0.0; + + +long double +__remquol (long double x, long double y, int *quo) +{ + int64_t hx,hy; + u_int64_t sx,lx,ly,qs; + int cquo; + double xhi, xlo, yhi, ylo; + + ldbl_unpack (x, &xhi, &xlo); + EXTRACT_WORDS64 (hx, xhi); + EXTRACT_WORDS64 (lx, xlo); + ldbl_unpack (y, &yhi, &ylo); + EXTRACT_WORDS64 (hy, yhi); + EXTRACT_WORDS64 (ly, ylo); + sx = hx & 0x8000000000000000ULL; + qs = sx ^ (hy & 0x8000000000000000ULL); + ly ^= hy & 0x8000000000000000ULL; + hy &= 0x7fffffffffffffffLL; + lx ^= sx; + hx &= 0x7fffffffffffffffLL; + + /* Purge off exception values. */ + if (hy == 0) + return (x * y) / (x * y); /* y = 0 */ + if ((hx >= 0x7ff0000000000000LL) /* x not finite */ + || (hy > 0x7ff0000000000000LL)) /* y is NaN */ + return (x * y) / (x * y); + + if (hy <= 0x7fbfffffffffffffLL) + x = __ieee754_fmodl (x, 8 * y); /* now x < 8y */ + + if (((hx - hy) | (lx - ly)) == 0) + { + *quo = qs ? -1 : 1; + return zero * x; + } + + x = fabsl (x); + y = fabsl (y); + cquo = 0; + + if (hy <= 0x7fcfffffffffffffLL && x >= 4 * y) + { + x -= 4 * y; + cquo += 4; + } + if (hy <= 0x7fdfffffffffffffLL && x >= 2 * y) + { + x -= 2 * y; + cquo += 2; + } + + if (hy < 0x0020000000000000LL) + { + if (x + x > y) + { + x -= y; + ++cquo; + if (x + x >= y) + { + x -= y; + ++cquo; + } + } + } + else + { + long double y_half = 0.5L * y; + if (x > y_half) + { + x -= y; + ++cquo; + if (x >= y_half) + { + x -= y; + ++cquo; + } + } + } + + *quo = qs ? -cquo : cquo; + + /* Ensure correct sign of zero result in round-downward mode. */ + if (x == 0.0L) + x = 0.0L; + if (sx) + x = -x; + return x; +} +long_double_symbol (libm, __remquol, remquol); |